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Goodwill and Other Intangible Assets - Schedule of Goodwill Balances by Reporting Unit (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Goodwill [Line Items] |  |
Goodwill | $ 1,198.6 | $ 1,260.1
Jefferson Wells |  |
Goodwill [Line Items] |  |
Goodwill | 55.5 |
Netherlands |  |
Goodwill [Line Items] |  |
Goodwill | 114.5 |
Americas | United States |  |
Goodwill [Line Items] |  |
Goodwill | 490.2 | 490.3
Americas | United States | Jefferson Wells |  |
Goodwill [Line Items] |  |
Goodwill | 545.7 | 545.8
Northern Europe | Netherlands |  |
Goodwill [Line Items] |  |
Goodwill | 114.5 | 109.5
Northern Europe | United Kingdom |  |
Goodwill [Line Items] |  |
Goodwill | 94.7 | 97.3
Northern Europe | Germany |  |
Goodwill [Line Items] |  |
Goodwill |  | 67.2
Southern Europe | France |  |
Goodwill [Line Items] |  |
Goodwill | 70.3 | 67.3
Other Reporting Units |  |
Goodwill [Line Items] |  |
Goodwill | 311.3 | 310.9
Reportable segments | Americas |  |
Goodwill [Line Items] |  |
Goodwill | 534.3 | 535.6
Reportable segments | Northern Europe |  |
Goodwill [Line Items] |  |
Goodwill | 309.1 | 374.6
Reportable segments | Southern Europe |  |
Goodwill [Line Items] |  |
Goodwill | 149.9 | 144.8
Reportable segments | Right Management |  |
Goodwill [Line Items] |  |
Goodwill | $ 62.1 | $ 62.1

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